Why?

Tonight, Thing 1 disappeared into the Alphas' bathroom for a little bit. Then she walked into the kitchen, looked at Alpha Female, made a little bit of a gagging sound and started spitting out ponytail holders. I counted them. She had six adult sized ponytail holders in her mouth. For some reason, she felt compelled to take them out of a drawer in the bathroom, cram them into her mouth, carry them across the house in her mouth, and then regurgitate them in front of Alpha Female. Why does she decide to do that, but not decide to tell an Alpha when she has poop in her diaper? Humans are weird.